Guitar chord height

Loosen the guitar string! Take out the small plastic piece on the neck of the piano and buy a piece of sandpaper. The smaller the particle size, the better. Generally speaking, it is recommended not to grind more than 5mm at a time. Try grinding it at the same time. Also remind me that the chord height of 12 is normal for xylophone! The neck of the piano is bent. There is a hole in the speaker that can be tuned by the keys, but you'd better find someone who can help you tune it for the first time ~ you'll learn it yourself ~